Passive Protection in Action: The Power of Door Control. . Active fire protection systems (like sprinklers and alarms) get the headlines, but this fire behavior demonstration highlights the role of Passive Fire Protection. . This small-scale simulation clearly shows how air flow, driven by an open door, can accelerate a fire dramatically. . A closed door is a simple act of compartmentalization-a core principle of passive fire protection-that limits oxygen and slows spread. . By understanding fir